[texhax] Reference in a Appendix

[Darío]

> Hi list, i need reference some equations and tables in the appendix,
> the way they need is, for example:
> "equation" (A.1)
> "table" (A.1)
> because i get
> "equation" (4.1)
> "table" (4.1)
> i don't use command \appendix, only \section{Apéndice}, and the
> equations and tables its labels are
> \label{ec:ondas}
> \numberwithin{equation}{section}
>
> \label{tab:tension}
> \numberwithin{table}{section}
>
> Thanks all!

I have partly solved using
\begin{equation}
\tag{A.1}
.
.
.
but must be manually (the numbers)
Exist any way to do automatic?